<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../vue.js"></script>
    <style>
        .box{
            width: 100px;
            height: 30px;
            background-color: pink;
        }
        .red{
            background-color: red;
        }
        .yellow{
            background-color: yellow;
        }
        .blue{
            background-color: blue;
        }
    </style>
</head>
<body>
    <div id="app">
        <!-- 1.直接赋值一个变量 -->
        <div :class="classname">box</div>

        <!-- 2.在两个类名之间选择一个 -->
        <ul>
            <li :class="item % 2 == 1 ? 'red':'yellow' "v-if="(item) in 6">{{ item }}</li>
        </ul>
        <ul>
            <li :class="[item % 2 == 1 ? 'red':'yellow'] "v-if="(item) in 6">{{ item }}</li>
        </ul>
        <!-- 3.在多个类名之间选择一个
            <html标签 标签: class="{类名:布尔值,类名:布尔值......0}"> </html标签>
        -->
        <ul>
            <li :class="{'red' : item % 3 == 1,blue:item % 3 == 2,yellow: item % 30}" v-for="(item) in 9">{{ item }}</li>
        </ul>
    </div>
    <script>
        new Vue({
            el:"#app",
            data:{
                classname:"box"
            }
        })
    </script>
</body>
</html>